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HEAVY TRUCK BRAKES MICHIGAN MECHANIC STUDY GUIDE Graded A+
HEAVY TRUCK BRAKES MICHIGAN MECHANIC STUDY GUIDE Graded A+ 
AN ENGINE BRAKE (JACOBS BRAKE) 
A. IS A SELF-ENERGIZING SERVO TYPE. 
B. IS NORMALLY USED IN PLACE OF A SPRING BRAKE. 
C. RESTRICTS THE INTAKE PORT AND CAUSES A BUILD UP OF 30-45 LBS OF PRESSURE. 
D. OPENS THE EXHAUST VALVES NEAR THE TOP OF THE COMPRESSION STROKE TO RELEASE THE COMPRESSED AIR. (CORRECT AWNSER) 
 
 
IN THE SYSTEM SHOWN BELOW, THE PART AT C IS: 
A. AN INVERSION VALVE. (POSSIBLE CORRECT AWNSER) 
B. A SAFETY VALVE. 
C. A MOD...
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- Exam (elaborations)
- • 7 pages •
HEAVY TRUCK BRAKES MICHIGAN MECHANIC STUDY GUIDE Graded A+ 
AN ENGINE BRAKE (JACOBS BRAKE) 
A. IS A SELF-ENERGIZING SERVO TYPE. 
B. IS NORMALLY USED IN PLACE OF A SPRING BRAKE. 
C. RESTRICTS THE INTAKE PORT AND CAUSES A BUILD UP OF 30-45 LBS OF PRESSURE. 
D. OPENS THE EXHAUST VALVES NEAR THE TOP OF THE COMPRESSION STROKE TO RELEASE THE COMPRESSED AIR. (CORRECT AWNSER) 
 
 
IN THE SYSTEM SHOWN BELOW, THE PART AT C IS: 
A. AN INVERSION VALVE. (POSSIBLE CORRECT AWNSER) 
B. A SAFETY VALVE. 
C. A MOD...
Michigan Airbrake CDL Test |Complete Questions with A+ Graded Answers
Michigan Airbrake CDL Test |Complete Questions with A+ Graded Answers 
The air brake system on a commercial motor vehicle is comprised of three separate systems. Can you name them? 
Service, Parking, Emergency brake system 
 
 
How often should the air tank be drained in the air brake system? 
If it is a manual drain valve, it should be drained of water and contaminants at the end of every day's driving. 
 
 
At what PSI does the air compressor "cut out"? 
The air compressor will shut down or...
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- • 2 pages •
Michigan Airbrake CDL Test |Complete Questions with A+ Graded Answers 
The air brake system on a commercial motor vehicle is comprised of three separate systems. Can you name them? 
Service, Parking, Emergency brake system 
 
 
How often should the air tank be drained in the air brake system? 
If it is a manual drain valve, it should be drained of water and contaminants at the end of every day's driving. 
 
 
At what PSI does the air compressor "cut out"? 
The air compressor will shut down or...
CDL Air Brakes |Complete Questions with Graded A+ Answers
CDL Air Brakes |Complete Questions with Graded A+ Answers 
After every working day 
Oil and water usually collect in compresed air tanks. If you do not have an automatic tank drain, when should you drain the air tanks? 
 
 
Why drain water from the compressed air tanks? 
Water can freeze in cold weather and cause brake failure. 
 
 
The air brake system for a straight truck or bus should not leak at a rate of more than __________ psi per minute with the engine off and the brakes released. 
2 
 
...
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- • 12 pages •
CDL Air Brakes |Complete Questions with Graded A+ Answers 
After every working day 
Oil and water usually collect in compresed air tanks. If you do not have an automatic tank drain, when should you drain the air tanks? 
 
 
Why drain water from the compressed air tanks? 
Water can freeze in cold weather and cause brake failure. 
 
 
The air brake system for a straight truck or bus should not leak at a rate of more than __________ psi per minute with the engine off and the brakes released. 
2 
 
...
CDL Air Brakes |Complete Questions with Graded A+ Answers
CDL Air Brakes |Complete Questions with Graded A+ Answers 
Air loss in a straight truck or bus should not be more than how much PSI with the engine off and the brakes on? 
3 PSI in one minute 
 
 
To make an emergency stop with air brakes, using the stab braking method, you should 
Brake as hard as you can 
 
get off brakes when wheels lock 
 
get back on brakes when wheels start rolling again 
 
 
All vehicles with air brakes must have what signal? 
Low air pressure warning signal 
 
 
It is ac...
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- Exam (elaborations)
- • 8 pages •
CDL Air Brakes |Complete Questions with Graded A+ Answers 
Air loss in a straight truck or bus should not be more than how much PSI with the engine off and the brakes on? 
3 PSI in one minute 
 
 
To make an emergency stop with air brakes, using the stab braking method, you should 
Brake as hard as you can 
 
get off brakes when wheels lock 
 
get back on brakes when wheels start rolling again 
 
 
All vehicles with air brakes must have what signal? 
Low air pressure warning signal 
 
 
It is ac...
Michigan CDL Air Brakes Exam Complete Questions with Graded A+ Correct Answers
Michigan CDL Air Brakes Exam Complete Questions with Graded A+ Correct Answers 
3 different braking systems that make up Air Brakes 
Service Brake, Parking Brake, Emergency Brake 
 
 
Air Compressor 
Pumps air into storage tanks and connected to the engine via gears or a v-belt. 
 
 
Air Compressor Governor 
Controls when the air compressor will pump air into the air storage tanks. When tank pressure rises to the cut-out level, the governor stops the compressor from pumping. When the tank pressu...
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- • 4 pages •
Michigan CDL Air Brakes Exam Complete Questions with Graded A+ Correct Answers 
3 different braking systems that make up Air Brakes 
Service Brake, Parking Brake, Emergency Brake 
 
 
Air Compressor 
Pumps air into storage tanks and connected to the engine via gears or a v-belt. 
 
 
Air Compressor Governor 
Controls when the air compressor will pump air into the air storage tanks. When tank pressure rises to the cut-out level, the governor stops the compressor from pumping. When the tank pressu...
SOS brake & braking system Exam|100% Verified PASS!!!
SOS brake & braking system Exam|100% Verified PASS!!! 
In a single anchor bendix drum type rear brake 
the secondary lining is longer than the primary 
 
 
Compared to the secondary shoe lining areas of drum brakes, the primary shoe lining area is: 
smaller and goes toward the front of the car 
 
 
During a brake overhaul, you notice that the brake fluid seems to be very dirty and dark in color. What should you do? 
flush the system before the new parts are installed 
 
 
In order to bleed the s...
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- Exam (elaborations)
- • 8 pages •
SOS brake & braking system Exam|100% Verified PASS!!! 
In a single anchor bendix drum type rear brake 
the secondary lining is longer than the primary 
 
 
Compared to the secondary shoe lining areas of drum brakes, the primary shoe lining area is: 
smaller and goes toward the front of the car 
 
 
During a brake overhaul, you notice that the brake fluid seems to be very dirty and dark in color. What should you do? 
flush the system before the new parts are installed 
 
 
In order to bleed the s...
ASE S4 Brakes |Complete Questions with Graded A+ Correct Answers
ASE S4 Brakes |Complete Questions with Graded A+ Correct Answers 
The air system is maintained at what pressure? 
100 to 120 pounds per square inch. 
 
 
At what pressure does the low pressure switch activate? 
Below 60 pounds per square inch. 
 
 
A safety or pop off valve is usually installed in which reservoir? 
In the one closest to the compressor. 
 
 
Why is the Wet tank referred to as such? 
It is the one closest to the compressor and has the most water in it. 
 
 
What is an after cooler...
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- Exam (elaborations)
- • 8 pages •
ASE S4 Brakes |Complete Questions with Graded A+ Correct Answers 
The air system is maintained at what pressure? 
100 to 120 pounds per square inch. 
 
 
At what pressure does the low pressure switch activate? 
Below 60 pounds per square inch. 
 
 
A safety or pop off valve is usually installed in which reservoir? 
In the one closest to the compressor. 
 
 
Why is the Wet tank referred to as such? 
It is the one closest to the compressor and has the most water in it. 
 
 
What is an after cooler...
ASE BRAKES Exam #1|Complete Answers Graded A+
ASE BRAKES Exam #1|Complete Answers Graded A+ 
A 
A drum is chattering on the brake lathe. This could be the result of: 
A. Failure to install the dampening belt. 
B. Cutting too slowly. 
C. Dull cutting blades. 
D. Cutting speed too fast. 
 
 
C 
A vehicle is equipped with a hydro-boost brake system has a hard pedal with little braking action. Which of the following could be the cause? 
A. Low brake fluid 
B. Air in the brake fluid 
C. Low power steering fluid 
D. An overtightened power steerin...
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- Exam (elaborations)
- • 7 pages •
ASE BRAKES Exam #1|Complete Answers Graded A+ 
A 
A drum is chattering on the brake lathe. This could be the result of: 
A. Failure to install the dampening belt. 
B. Cutting too slowly. 
C. Dull cutting blades. 
D. Cutting speed too fast. 
 
 
C 
A vehicle is equipped with a hydro-boost brake system has a hard pedal with little braking action. Which of the following could be the cause? 
A. Low brake fluid 
B. Air in the brake fluid 
C. Low power steering fluid 
D. An overtightened power steerin...
T4 ASE Brakes Exam with complete Graded A+ solutions
T4 ASE Brakes Exam with complete Graded A+ solutions 
Which of the following could cause the brakes on a truck to wear too fast? 
A. glazed drums 
B. wrong linings installed 
C. Low air pressure 
D. governor cut out pressure 
B. wrong linings installed 
 
 
which of the following could cause one brake on a truck to wear faster than the others? 
A. mismatched service brake chambers 
B. mismatched parking chambers 
C. low air pressure in service tanks 
D. governor cut out too low 
A. mismatched se...
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- Exam (elaborations)
- • 5 pages •
T4 ASE Brakes Exam with complete Graded A+ solutions 
Which of the following could cause the brakes on a truck to wear too fast? 
A. glazed drums 
B. wrong linings installed 
C. Low air pressure 
D. governor cut out pressure 
B. wrong linings installed 
 
 
which of the following could cause one brake on a truck to wear faster than the others? 
A. mismatched service brake chambers 
B. mismatched parking chambers 
C. low air pressure in service tanks 
D. governor cut out too low 
A. mismatched se...
T4 ASE Brakes Exam with complete Graded A+ solutions
T4 ASE Brakes Exam with complete Graded A+ solutions 
Psi loss rate for Straight Truck 
2 psi/minute 
 
 
Psi loss rate for combination vehicle 
less than 3 psi/minute 
 
 
Service Brake Pressure Drop Test 
Apply service brake to 90 psi. Loss rate should be less than 3 psi/minute for straight vehicles and less than 4 psi/minute for combination vehicles. 
 
 
Improperly adjusted brake shoes 
Cause 
 
1) brake imbalance 
2) increased stopping distance 
3) excessive heat and wear 
 
 
Instability a...
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- Exam (elaborations)
- • 9 pages •
T4 ASE Brakes Exam with complete Graded A+ solutions 
Psi loss rate for Straight Truck 
2 psi/minute 
 
 
Psi loss rate for combination vehicle 
less than 3 psi/minute 
 
 
Service Brake Pressure Drop Test 
Apply service brake to 90 psi. Loss rate should be less than 3 psi/minute for straight vehicles and less than 4 psi/minute for combination vehicles. 
 
 
Improperly adjusted brake shoes 
Cause 
 
1) brake imbalance 
2) increased stopping distance 
3) excessive heat and wear 
 
 
Instability a...
BSN 206 Hallmark Exam Questions And Correct Answers With Complete Verified Solution.
Maine Life Insurance Exam Questions With Complete Solutions.
NYSTCE Students with Disabilities CST [060]. Exam Prep 2024.
Complete Solution Manual for Intermediate Accounting, 11th Edition
KIN 2501 - Dr. Jacobson Exam 2 all notes VERRIFED